Open your browser.
Go to
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Login with admin as the user and admin as the password (unless you changed it...and if you didn't change it, you should do that first).
Click on Advanced.
Click on Port Forwarding.
Check the User radio button.
Click New.
Give a Rule Name.
Click the protocol drop-down box and pick the protocol you are using.
If it's only one port, enter that port in the Port Start, Port End and Port Map boxes.
If it's a range, enter the start (lowest number) in the Port Start and Port Map boxes and the end (highest port number) in the Port End box.
Click Submit.
Now highlight the rule you just made in the Available Rules box and click ADD> so you see it in the Apllied Rules box.
Click Save at the top of the screen (not submit at the bottom).
Done.